Abstract:Aimed at solving the problem of quasi-geoid controlled by linear or strip of GPS-leveling points, Coons surface interpolation model is put forward. The first step is to synthesize GPS-leveling points fitting curve, and then the curve is used to construct the surface, as far as possible to reduce the traditional fitting method by point directly on the accuracy of consumption. Respectively, using the least squares method, least square collocation method, moving interpolation and Coons surface method to fit quasi-geoid controlled by linear or strip of GPS-leveling points, the result showed that the interpolation model based on Coons surface algorithm accuracy is the highest.